package edu.pet.Filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter{

	public void destroy() {
		
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest)arg0;
		HttpServletResponse response = (HttpServletResponse)arg1;
		HttpSession session = request.getSession(true);
		if(session.getAttribute("login")==null){
			session.setAttribute("msg", "未登录！");
			response.sendRedirect("../index.jsp");
		}else
			arg2.doFilter(arg0, arg1);
		
	}

	public void init(FilterConfig arg0) throws ServletException {
		
	}

}
